This document defines an extension to the timestamp format defined in
RFC 3339 for representing additional information, including a time
zone. 
       It updates RFC 3339 in the specific interpretation of the local offset
 Z , which is no longer understood to "imply that UTC is the preferred
reference point for the specified time".

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RFC 9557 introduces the Internet Extended Date/Time Format (IXDTF), an extension of the RFC 3339 timestamp format. This new format allows for the inclusion of additional context, such as time zones, which was previously handled in a non-standard manner. The document shifts the interpretation of the local offset 'Z' to imply that the time in UTC is known but the offset to local time is unknown. These changes aim to improve interoperability and standardization in various Internet applications handling date and time.

RFC 9557: Date and Time on the Internet: Timestamps with Additional Information

3.3. Optional Generation and Elective vs. Critical Consumption